[asterisk-users] Help with concurrent VoIP calls

[John Timms]

Thanks for suggestions, everyone- I should have thought about jitter and
latency as I began to use up more & more bandwidth. I was concerned that it
was a problem with my configuration of Asterisk, but it looks like is really
is a bandwidth issue. By the way, Joe- I've been in another situation with
my cableco & Asterisk/VoIP (on a business connection!) and would frequently
have trouble getting *one* call that sounded good, even though we had
several megabits up & down, with no other traffic on the network. Charter's
service is horrible- there were several times pinging Google took over 1
second.

John Timms


On Sat, Nov 7, 2009 at 2:45 PM, John Timms <johngtimms at gmail.com> wrote:

> Hi. I'm having trouble figuring out why I'm not able to make many
> concurrent VoIP calls on my system. I'm not aiming for a huge number,
> because I have purposely bought a low powered system, but I would
> think that I could get more. Here are the details:
>
> I have a small-form-factor Asterisk server with an Intel Atom 230 CPU
> (1.6 GHz, 533 MHz FSB) and 512 MB DDR2 533. It is running Ubuntu
> Server 9.04 with the default Debian package manager installation of
> Asterisk. (version 1.4)
>
> Here is what is going on: I'm making outgoing calls (with .call files)
> via SIP (using Vitelity's service, if anyone wants to know) with about
> 55.0 ms latency between my Bellsouth DSL connection & their servers.
> I'm using GSM-format prompts with GSM encoding (disallow=all,
> allow=gsm in sip.conf) and I'm able to make about 7 concurrent calls.
> I have a very fast internet connection, so there is still plenty of
> bandwidth, and the "top" command shows that Asterisk is only at about
> 5% CPU and 10% RAM. Even with only 7 calls, a landline phone will
> "skip" occcasionally, but cell phones have perfect quality.
>
> I don't think that 7 calls is very many, I'll be happy if I can get 10
> good-sounding calls. Can anyone give suggestions? (If this has been
> hashed out elsewhere, I'm happy with a link to more information!)
>
> Thanks.
>
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